EP3377244A1 - Ouvertures d'amenée et d'évacuation coulées dans des pistons en fonte d'acier et en fonte de fer - Google Patents

Ouvertures d'amenée et d'évacuation coulées dans des pistons en fonte d'acier et en fonte de fer

Info

Publication number
EP3377244A1
EP3377244A1 EP16801730.9A EP16801730A EP3377244A1 EP 3377244 A1 EP3377244 A1 EP 3377244A1 EP 16801730 A EP16801730 A EP 16801730A EP 3377244 A1 EP3377244 A1 EP 3377244A1
Authority
EP
European Patent Office
Prior art keywords
core
piston
cast
casting
opening
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP16801730.9A
Other languages
German (de)
English (en)
Inventor
Gregor Müller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KS Kolbenschmidt GmbH
Original Assignee
KS Kolbenschmidt GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by KS Kolbenschmidt GmbH filed Critical KS Kolbenschmidt GmbH
Publication of EP3377244A1 publication Critical patent/EP3377244A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
    • B22D15/02—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor of cylinders, pistons, bearing shells or like thin-walled objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/16—Pistons  having cooling means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/16—Pistons  having cooling means
    • F02F3/20—Pistons  having cooling means the means being a fluid flowing through or along piston
    • F02F3/22—Pistons  having cooling means the means being a fluid flowing through or along piston the fluid being liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B22C9/04—Use of lost patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
    • B22D29/001—Removing cores
    • B22D29/002—Removing cores by leaching, washing or dissolving

Definitions

  • the invention relates to a method of manufacturing a piston having a lost-core cooling channel, wherein in a casting process using a casting mold into which the core is inserted prior to casting, a piston blank is cast using a casting melt and after solidification the foundry melt is taken from the piston blank of the mold and then the core is rinsed out and then a finishing of the piston blank to produce the piston, according to the features of the preamble of claim 1.
  • a lost core such as a sand core
  • a metallic holding piece wherein in the casting mold, a permanent magnet is present, on which this metallic holding piece is placed and thereby held.
  • the underside of the lost core surrounding the metallic holding piece rests on the holding device, in which the permanent magnet is, so that thereby a cylindrical end of the core is realized.
  • the core extends into a region of the casting mold which forms an inner region of the piston blank and, with the core, forms at least one opening having a rounded profile for the cooling channel after rinsing.
  • a lost nucleus e.g. a salt or sand core
  • any shapes of the opening can be realized.
  • the cross-section of the opening no longer has to be round, but may also have oval or any other shapes which are roundish in cross-section.
  • the lost core completely forms the opening area for access to the cooling channel, namely also starting from the interior of the piston, so that it must be rinsed only after casting and solidification of the casting melt. Machining operations, such as Drilling (in particular for the realization of the opening itself), or reworking by machining processes are completely eliminated, so that according to the invention there is no risk that smaller particles, which are produced during the machining, can penetrate into the cooling circuit of the internal combustion engine.
  • any shapes are provided in a further development of the invention that is formed as an opening at least one inlet opening with a circumferential bead by means of the core, optionally supplemented by the formation of the opening by means of the lost core at least as a drain opening also with a circumferential bead.
  • the invention therefore, not just an opening from the direction of the inner region of the piston is introduced in the direction of the cooling channel, but this also designed advantageous.
  • the circumferential bead at least around the inlet opening this area is not only reinforced but also given a shape by means of which cracks in the structure of the material around the opening are effectively avoided.
  • the cross-section of the opening must not be circular, but may also be viewed in cross-section oval or formed in its circulation with several changes in the course of an arcuate shape.
  • a beam splitter is formed.
  • This beam splitter is, for example, at the apex of the cooling channel, so that it protrudes downwards into the free region of the cooling channel when the piston stroke axis is considered.
  • an oil jet which is injected via the at least one inlet opening in the direction of the cooling channel, can be directed in a specific direction or in two different directions.
  • FIG. 1 shows a piston blank 1, which has an outer contour designated 2 after its production.
  • the piston blank 1 is produced by means of a corresponding casting process using a casting mold, wherein the casting mold has the inner contour of the outer contour 2 of the piston blank 1.
  • the casting mold can be designed in one or more parts.
  • a lost core 3 is provided, which is suitably arranged on or on the casting mold, eg the inner insert of the casting mold. It is also conceivable to provide more than one lost core 3.
  • the casting mold is filled with cast melt and waited until it has solidified. Subsequently, the mold is removed, wherein initially the lost core 3 remains in the produced piston blank 1. This is rinsed out in the usual form, thereby creating an interior in the piston blank 1 is formed, which corresponds to the outer shape of the core 3 and forms a cooling channel 4.
  • the contour shown in Figure 1 or the course of the cooling channel 4 is exemplary and not limited thereto. 5 with a dashed line is a finished contour after the piston blank 1 has been further processed. In particular, this finishing is done by machining the outer region of the piston blank 1. This finishing is done either after or possibly before rinsing the core 3.
  • the finished piston finally has per se known elements, such as a ring field, a pin bore 6, a piston skirt 7 and other conventional elements (such as optionally a combustion bowl) on ,
  • FIG. 2 shows a view into an inner region of a finished piston 8, which is based on the piston blank 1 according to FIG.
  • a finished piston 8 which is based on the piston blank 1 according to FIG.
  • connecting walls extend in the direction of the supporting piston shanks 7.
  • These are arranged on the underside of the upper part of the finished piston 8, wherein at least one inlet opening 9 is located on this underside.
  • a circumferential bead 10 is arranged around the inlet opening 9 around.
  • the cross section of the inlet opening 9 is circular, but may deviate from this geometric shape. The same then applies to the circumferential bead 10th
  • the injection of cooling oil takes place via the (at least one) inlet opening 9, so that the cooling oil can circulate in the cooling channel 4.
  • at least one drain opening 12 is present, which also with a circumferential bead thirteenth is provided, but does not have to be.
  • the openings 9, 12 are produced according to the invention mitteis the lost core 3, wherein by means of the lost core, which extends into a region of the mold, which forms an inner region of the piston blank 1, and the rounded Course of the opening 9, 12, for example, realized with the reinforcement of the respective area serving circumferential bead 0, 13, is produced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un piston (8) qui comprend un canal de refroidissement (4) produit au moyen d'un noyau perdu (3), une ébauche de piston (1) étant coulée en utilisant une matière en fonte de coulée selon un procédé de coulage en utilisant un moule de coulée, dans lequel le noyau (3) a été placé avant la coulée et après la solidification de la matière fondue de coulée, l'ébauche de piston (1) étant retirée du moule de coulée puis le noyau (3) étant rincé et ensuite un usinage de finition de l'ébauche de piston (1) ayant lieu pour produire le piston (8), le noyau (3) s'étendant jusque dans une zone du moule de coulée qui forme une zone intérieure de l'ébauche de piston (1) et, à l'aide du noyau (3), au moins une ouverture présentant une allure arrondie pour le canal de refroidissement (4) étant formée après le rinçage.
EP16801730.9A 2015-11-19 2016-11-17 Ouvertures d'amenée et d'évacuation coulées dans des pistons en fonte d'acier et en fonte de fer Pending EP3377244A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015222878 2015-11-19
PCT/EP2016/077950 WO2017085164A1 (fr) 2015-11-19 2016-11-17 Ouvertures d'amenée et d'évacuation coulées dans des pistons en fonte d'acier et en fonte de fer

Publications (1)

Publication Number Publication Date
EP3377244A1 true EP3377244A1 (fr) 2018-09-26

Family

ID=57406214

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16801730.9A Pending EP3377244A1 (fr) 2015-11-19 2016-11-17 Ouvertures d'amenée et d'évacuation coulées dans des pistons en fonte d'acier et en fonte de fer

Country Status (7)

Country Link
US (1) US20180326477A1 (fr)
EP (1) EP3377244A1 (fr)
CN (1) CN108367340B (fr)
BR (1) BR112018009733A8 (fr)
DE (1) DE102016122080A1 (fr)
MX (1) MX2018005970A (fr)
WO (1) WO2017085164A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018114969A1 (fr) 2016-12-19 2018-06-28 Ks Kolbenschmidt Gmbh Canal de refroidissement comprenant une digue et une trémie
EP3612727A1 (fr) 2017-04-19 2020-02-26 KS Kolbenschmidt GmbH Piston en mode de construction structurelle
CN113748263A (zh) * 2019-04-09 2021-12-03 Ks科尔本施密特有限公司 具有通向冷却通道中的漏斗形的进口的冷却通道活塞

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6015041A (ja) 1983-07-05 1985-01-25 Aisin Seiki Co Ltd 冷却空洞付ピストンの製造方法
JP2764071B2 (ja) * 1988-10-31 1998-06-11 イズミ工業株式会社 内燃機関用ピストンの製造方法
JP4276602B2 (ja) * 2004-09-21 2009-06-10 株式会社豊田自動織機 内燃機関用ピストン
DE202006020280U1 (de) * 2006-11-28 2008-02-21 Ks Kolbenschmidt Gmbh Kühlkanalkolben
DE102007044105A1 (de) * 2007-04-27 2008-10-30 Mahle International Gmbh Gießkern zur Bildung eines Kühlkanals in einem gießtechnisch hergestellten Kolben
DE102008020231A1 (de) * 2008-04-22 2009-10-29 Mahle International Gmbh Gießkern zur Bildung eines Kühlkanals
DE102008002571A1 (de) * 2008-06-20 2009-12-31 Federal-Mogul Nürnberg GmbH Kolben für einen Verbrennungsmotor
DE102011007285A1 (de) * 2011-04-13 2012-10-18 Mahle International Gmbh Kolben für eine Brennkraftmaschine
DE102011086411A1 (de) * 2011-11-15 2013-05-16 Mahle International Gmbh Gießform für einen Kolben
DE102012215543A1 (de) * 2012-08-31 2014-03-06 Mahle International Gmbh Gießform eines Kolbens
MX2013009848A (es) * 2012-09-11 2014-03-25 Gm Global Tech Operations Inc Fundicion en arena de un piston diesel de aluminio con un recipiente de combustion reentrante de colado para motores diesel de trabajo ligero o medio.
DE102012217939A1 (de) * 2012-10-01 2014-04-03 Mahle International Gmbh Verfahren zur Herstellung von Kernen für die gießtechnische Herstellung von Werkstücken
US9989008B2 (en) * 2014-04-09 2018-06-05 Ks Kolbenschmidt Gmbh Elongate cooling channel inlet for cooling channel pistons and method for operating

Also Published As

Publication number Publication date
MX2018005970A (es) 2018-09-05
BR112018009733A2 (pt) 2018-11-06
CN108367340A (zh) 2018-08-03
BR112018009733A8 (pt) 2019-02-26
WO2017085164A1 (fr) 2017-05-26
CN108367340B (zh) 2020-04-14
US20180326477A1 (en) 2018-11-15
DE102016122080A1 (de) 2017-05-24

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